Since my reservation in Restaurant Schønnemann was cancelled by them since I arrived 30 minutes late, I went back to Nørreport Station, asked the staff in the information center a good place to eat Smørrebrød (Danish open-sanwich), directed to a restaurant, on the way, I found this nice market / food court, and found the Smørrebrød stall, where local people were in line, so "follow the local", I bought my Smørrebrød lunch here in this market.
